The ex-Tory Cabinet Minister has been questioned in relation to allegations by a woman she was sexually assaulted at the age of 19.

Detectives questioned the Life Peer under caution last month and it was reported the incident allegedly took place in 1967 following a blind date.

Met Police are investigating claims that alleged incident took place at Lord Brittan’s London flat.

Downing Street last night refused to be drawn on whether David Cameron had been made aware of the extraordinary claims.

Asked about the allegations, a No10 spokeswoman said last night: “We are not commenting”.

The former Tory, who married wife Diana in 1980, is understood to have strongly denied the allegations to police.

Refusing to comment about the police probe, Lord Brittan reportedly said: “I’m sorry I’m not going to talk about anything like that.”

Lord Brittan was Home Secretary in Margaret Thatcher’s Conservative Government between 1983 and 1985.

At the time of the alleged incident Lord Brittan was not an MP after unsuccessfully contesting the North Kensington seat in 1966.

The police interview is said to have taken place at the central London offices of Mishcon de Reya.

PA

Cabinet: Brittan (R) with Thatcher

Lord Brittan, 74 , was this week asked for an explanation over the missing 40-page dossier detailing claims of a Westminster paedophile ring.

Mr Cameron has ordered an inquiry into the documents and more than 130 MPs are now calling for an investigation into allegations.

Lord Brittan has confirmed he received a ‘substantial bundle of papers’ from MP Geoffrey Dickens in 1983 – which detailed allegations of a paedophile network within Parliament and Whitehall – and passed them to his officials for investigation.

The Home Office admits the dossier was either lost or destroyed.

Lord Brittan initially said he could not remember receiving the dossier from Mr Dickens but on Wednesday released a statement confirming he had been given it, asked officials to look into the claims and could not remember hearing any more about it.

However, a 2013 Home Office review revealed that he had written to Mr Dickens in 1984 saying the dossier had been handed to police. Lord Brittan then released a second statement saying he had only just been made aware of the review, which proved that appropriate action had been taken.

In a statement about the rape allegations, the Met Police said last night: “In late 2012, a woman alleged to the Metropolitan Police Service that she was raped by a man in 1967 at an address in London.

“The woman was over the age of 18 at the time of the incident. The allegation is being investigated by officers from the Sexual Offences, Exploitation and Child Abuse Command.

“In June 2014, a man aged in his 70s was interviewed under caution by appointment at a central London location in connection with the allegation. He was not arrested. Enquiries continue.”

Labour have demanded an investigation into the way the Home Office handled the evidence in Mr Dickens’s

Former children’s minister Tim Loughton said he would consider, if necessary, using parliamentary privilege to name high-profile people accused of child abuse.

Labour MP John Mann said it looked bad that there were independent inquiries into historic child abuse at the BBC and the NHS but that one for Westminster was being denied.

Mr Dickens, who died in 1995, told his family the dossier details would ‘blow the lid off’ the lives of powerful and famous child abusers, his son said.

Barry Dickens said the Tory MP would have been ‘hugely angered’ that the allegations had not been properly investigated.